Finding the Fourth Proportional to 12,815.52, 17,685.42 and 7,226.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,815.52 : 17,685.42 = 7,226.52 : x
2. Step 2: Convert to fraction form
   12,815.52/17,685.42 = 7,226.52/x
3. Step 3: Cross multiply
   12,815.52x = 17,685.42 × 7,226.52
4. Step 4: Simplify right side
   12,815.52x = 127,804,041.34
5. Step 5: Solve for x
   x = 127,804,041.34/12,815.52
6. Step 6: Final answer
   x = 9,972.60